Gaya APA

M.A, A. (1991). Essential Enflish usage and grammar (j-3,c-1). Surabaya: INDAH Surabaya.

Gaya MLA

M.A, Alter. "Essential Enflish usage and grammar". j-3,c-1 Surabaya: INDAH Surabaya, 1991. 400_Language.